   #PHP Manual Array Functions array_sum array_udiff_uassoc

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                               array_udiff_assoc

   (no version information, might be only in CVS)
   array_udiff_assoc -- Computes the difference of arrays with additional
   index check. The data is compared by using a callback function.

Description

   array array_udiff_assoc ( array array1, array array2 [, array ...,
   callback data_compare_func])

   array_udiff_assoc() returns an array containing all the values from
   array1 that are not present in any of the other arguments. Note that
   the keys are used in the comparison unlike array_diff() and
   array_udiff(). The comparison of arrays' data is performed by using an
   user-supplied callback. In this aspect the behaviour is opposite to
   the behaviour of array_diff_assoc() which uses internal function for
   comparison.

   Example 1. array_udiff_assoc() example
   <?php
   class cr {
       var $priv_member;
       function cr($val) {
           $this->priv_member = $val;
       }
       function comp_func_cr($a, $b) {
           if ($a->priv_member === $b->priv_member) return 0;
           return ($a->priv_member > $b->priv_member)? 1:-1;
       }
   }
   $a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23),
   1=> new cr(4), 2 => new cr(-15),);
   $b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3),
   1=> new cr(4), 2 => new cr(-15),);
   $result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
   print_r($result);
   ?>

   The result is:
Array
(
    [0.1] => cr Object
        (
            [priv_member:private] => 9
        )

    [0.5] => cr Object
        (
            [priv_member:private] => 12
        )

    [0] => cr Object
        (
            [priv_member:private] => 23
        )
)

   In our example above you see the "1" => new cr(4) pair is present in
   both arrays and thus it is not in the ouput from the function.

   For comparison is used the user supplied callback function. It must
   return an integer less than, equal to, or greater than zero if the
   first argument is considered to be respectively less than, equal to,
   or greater than the second.

     Note: Please note that this function only checks one dimension of a
     n-dimensional array. Of course you can check deeper dimensions by
     using, for example, array_udiff_assoc($array1[0], $array2[0],
     "some_comparison_func");.

   See also array_diff(), array_diff_assoc(), array_diff_uassoc(),
   array_udiff(), array_udiff_uassoc(), array_intersect(),
   array_intersect_assoc(), array_uintersect(), array_uintersect_assoc()
   and array_uintersect_uassoc().
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